Adsorption characteristics of p-xylene-alpha,alpha -dithol on gold and silver surfaces: Surface-enhanced Raman scattering and ellipsometry study

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The adsorption behavior of p-xylene-alpha, alpha'-dithiol (p-XDT) on colloidal gold and silver surfaces has been investigated by means of surface-enhanced Raman scattering (SERS). p-XDT chemisorbed dissociatively on both the gold and silver surfaces but as mono- and dithiolate, respectively. Regardless of the bulk concentration of p-XDT, only a monolayer was assembled on the silver surface with a flat orientation by forming two Ag-S bonds. On the gold surface, the monothiolate species, p-XDT1-, appeared to assume a rather flat orientation at a very low surface coverage, but as the surface coverage was increased, the adsorbate took a perpendicular orientation. Furthermore, when the bulk concentration of p-XDT was close to that required for a full-monolayer coverage limit, a band assignable to the S-S stretching vibration appeared at similar to 509 cm(-1) in the gold sol SER spectra. A separate ellipsometry measurement performed with vacuum-evaporated gold substrates revealed that up to trilayers could be assembled on gold in 1 mM n-hexane solution of p-XDT while only a monolayer formed in either methanol or ethanol solution. Although the exact causes were uncertain, such a difference in behavior seemed to have nothing to do with the oxygen species present in ethanol or methanol solution.
Publisher
AMER CHEMICAL SOC
Issue Date
1999-12
Language
English
Article Type
Article
Citation

JOURNAL OF PHYSICAL CHEMISTRY B, v.103, no.49, pp.10831 - 10837

ISSN
1089-5647
DOI
10.1021/jp992230+
URI
http://hdl.handle.net/10203/75456
Appears in Collection
CH-Journal Papers(저널논문)
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